I have a 4023-S and a 1023 within a saddle conversion kit (thank you for that tip). With the single belt circumstance we're running, I understand that resistance generated from an alternator capable of producing more than 100A on a 44hp Yanmar could place too much pressure on the Yanmar's water pump bearing. I typically run the engine around 2200rpm and rarely pass 2600. The 4023 is rated to 124A; the 1023, to 105A. Based on the above understanding, I was planning on installing the smaller 1023 as the primary, keeping the larger 4023 as the back up. Appreciating that my understanding may be invalid or incomplete, could you please advise me as to whether my choice to make the smaller alternator the primary a good one?